Conventional traction vehicles for a.c.-mains contain a line-transformer in the propulsion chain. This transformer, especially for 15 kV/16.7 Hz main lines, is bulky, expensive and has high losses. This paper proposes a completely new transformerless configuration which reduces weight and dimensions of the drive power chain and improves the efficiency. On the line side, series connected voltage source inverters are connected via a line choke to the overhead line. This leads to d.c.-links on different voltage potentials, which ask for a new motor concept. The proposed 3-star induction motor with three independant 3-phase windings is fed by three 3-phase inverters on different voltage potentials. A new control structure for this 3-star induction motor becomes necessary and is proposed.
| Filename: | EPE Journal - 10-3-4 - 6 - Steiner |
| Filesize: | 1.41 MB |
